I have both. They are two really different cubes, and I don’t think either is better because you can adjust your turning to the cube. However, the Gan 12 does not feel like any cube I used before so it takes a while to adjust to it.
Right now I average 2.5 on pyraminx.
Here is what methods I used when I averaged different times:
Sub 15: Lbl
Sub 10: Lbl
Sub 8: intuitive l4e
Sub 7: intuitive l45
Sub 6: intuitive l4e
Sub 5: intuitive l4e
Sub 4 : intuitive l4e & starting to experiment with keyhole
Sub 3.5: better l4e algs...